public class Main {
    public static void main(String[] args) {
        Person person = new Person("lili", 19);
        Person person2 = new Person("lucy", 20);


    }
}
class Person {
    String name;
    int age;

    public Person() {

    }

    Person(String name, int age) {
        this.name =name;
        this .age = age;
        System.out.println(String.format("this person is %s,her age is %d" , name, age));
    }
}